BasePair Parse(string word)
{
static SortedList<string, Type> mParser;
return new mParser[word];
[.net] Associating a string with a type
Author
This is probably pretty easy, but I'm not sure how to do it.
I have a parser for a small, custom scripting language that represents DNA of virtual creatures. I have an interface called BasePair that the different DNA commands inherit from.
What I want to do is create some sort of container that converts from strings to the implemented classes associated with that string, and vice versa.
For instance, I have an "Add" class that inherits from my BasePair interface. I'd like to associate it with the string "add", so I can easily parse between the two. I'd also use this container to select random commands to insert for mutations.
My initial try looks something like this:
But the compiler doesn't like that at all. Any ideas?
[Edited by - Numsgil on November 28, 2006 4:55:42 AM]
hi Numsgil,
you could try that
could work, actually sitting in work,
so you have to try, no time to check ;)
greets
tgar
you could try that
/* Base pair class */BasePair * BasePair::clone() = 0;/* Derived BasePair */BasePair * DerivedBP::clone(){ return ( new DerivedBP() );};/* you also have to add for each class one instance to mParser before use !!*/BasePair * Parse(string word){ static SortedList<string, Type> mParser; return ( mParser[word].clone() );};could work, actually sitting in work,
so you have to try, no time to check ;)
greets
tgar
Use System.Activator:
This will throw an exception if the type represented by mParser[key] cannot be default-constructed. CreateInstance() has overloads that can be used to pass values to the constructor if you want to enforce that, for example, the stored types have a constructor that takes a few ints:
Look up the documentation for System.Activator for more information.
object CreateObject(string key){ return System.Activator.CreateInstance(mParser[key]);}This will throw an exception if the type represented by mParser[key] cannot be default-constructed. CreateInstance() has overloads that can be used to pass values to the constructor if you want to enforce that, for example, the stored types have a constructor that takes a few ints:
object CreateObject(string key){ return System.Activator.CreateInstance(mParser[key],42,144,2808);}Look up the documentation for System.Activator for more information.
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